1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
MaRussiya [10]
3 years ago
9

Everyone buying a pizza at JR's pizzeria gets a card that conceals either a J or an R. When the waxcovering is rubbed off, the c

hance is 90% that a J will appear. Different cards can be treated as havingindependent letters.Once a person has both a J and R, she is entitled to a free pizza. Note that, because the same letter cancome up on several successive purchases, that rule is not equivalent to one free pizza per two paid ones.If Pamela starts patronizing the pizzeria, find the probability that:a) She receives an R on her first purchase.b) Her first two purchases yield a J and R, in that order.c) She is eligible for a free pizza after her first two purchases.d) It takes her exactly three purchases to earn a free pizza.
Mathematics
1 answer:
masya89 [10]3 years ago
4 0

Answer:

The probability that She receives an R on her first purchase is 0.1

The probability that her first two purchases yield a J and R, in that order is 0.09

The probability that She is eligible for a free pizza after her first two purchases 0.18

The probability that It takes her exactly three purchases to earn a free pizza   0.09

Step-by-step explanation:

Consider the provided information.

When the waxcovering is rubbed off, the chance is 90% that a J will appear.

Thus, the the chance or R will appear is 10%.

Part (a) She receives an R on her first purchase.

The probability of an R on first purchase is = 10/100 = 0.1

Part (b) Her first two purchases yield a J and R, in that order.

As we know the chance is 90% that a J will appear and 10% chance that R will appear.

Thus, the required probability is:

\frac{90}{100} \times \frac{10}{100}=0.9\times 0.1=0.09

Part (C) She is eligible for a free pizza after her first two purchases.

There are two possible case:

Case I: First time J comes and second time R comes

Case II: First time R comes and second time J comes

Thus, the required probability is:

0.9\times 0.1+0.1\times 0.9=0.09+0.09=0.18

Part (d) It takes her exactly three purchases to earn a free pizza.

There are two possible case:

Case I: First time J comes, second times J comes and third time R comes

Case II: First time R comes, second times R comes and third time J comes

Thus, the required probability is:

0.9\times 0.9\times 0.1+0.1\times 0.1\times 0.9=0.081+0.009=0.09

You might be interested in
What is the equation of the line?
BartSMP [9]
B. it’s the change in y over the change in x
7 0
2 years ago
Solve using elimination. –8x + 6y = –16 –8x + 9y = 8
stira [4]
I think this is right

5 0
2 years ago
James has an ice cube tray that makes ice in the shape of spheres rather than cubes. Each sphere of ice has a radius of 2cm, one
DedPeter [7]
<span>Each sphere of ice has a radius of 2cm
</span>one tray makes 6 spheres
<span>What is the total volume of ice the tray can make at one time?

Total volume of each sphere is </span><span>33.51 cm^3
The tray can hold 6 of these at a time
33.5 * 6
201 cm^3 total volume of ice that the tray can make at one time
Written in pi 
64 \pi cm^3

Hope this helps :)</span>
6 0
3 years ago
Mrs. Levi's class raised $217.35 in one-time donations for the library's new book collection. The class also had 4 people pledge
nexus9112 [7]

Answer: $817.35

Step-by-step explanation:

150x4 = 600

600+217.35 = 817.35

7 0
3 years ago
Factor: m^2 - 20m - 21
Ganezh [65]

(m-21) (m+1)there I thinks it's right unless I messed up my work

6 0
3 years ago
Read 2 more answers
Other questions:
  • If i go into an ice cream parlor, and i have the choice of having one of 10 different flavors, with one of 5 different toppings
    11·1 answer
  • What’s 12 rounded to the whole number
    10·2 answers
  • Students hike 16,900 feet one morning and 14,850 feet in the afternoon. Estimate the total number of miles they hiked that day.
    9·2 answers
  • 11/21 as a decimal and a percent
    11·1 answer
  • Please help me on numbers 5-7 thanks
    6·1 answer
  • A group Students surveyed chose basketball and soccer as their favorite sport in the retro 3 : 8
    13·1 answer
  • Jed is an electrician. Jed and his wife are accrual basis taxpayers and file a joint return. Jed wired a new house for Alison an
    11·1 answer
  • PLEASE ANSWER ASSP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    13·2 answers
  • Gloria rides a bike 8 miles in 40 minutes. Nanette rides a bike 5 miles in 30 minutes. Who bikes faster? Explain.
    5·2 answers
  • (6n – 7) + (8n + 2) = 23
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!